The next three texts are valuable as references and it is recommended that you pick up one of them.  They will all be available onsite for you to use. The first is the best ecology on the market at present.
 
Ecology: Individuals, populations and communities,  Michael Begon, John L. Harper, Colin T. Townsend,  1996, Blackwell Science Press

Biological Diversity: The coexistence of species on changing landscapes,  Michael A. Huston,  1996, Cambridge University Press.

Species Diversity in Space and Time,  Michael L. Rosenweig, 1999, Cambridge University Press.